What is ASTM A517 Grade B equivalent to?
ASTM A517 Grade B is primarily equivalent to ASTM A514 Grade B, with which it shares nearly identical chemistry and mechanical properties (100 ksi / 690 MPa minimum yield strength). A517 Grade B is designated for pressure vessels (using ASTM A20 tolerances), while A514 is for structural applications. It is also considered equivalent to US T-1 steel.
ASTM A517 Grade B is a premium-grade alloy steel plate manufactured through quenching and tempering heat treatment to achieve very high mechanical strength. It is primarily intended for pressure-containing equipment that must withstand high internal pressure and structural loads. Due to its controlled chemical composition and refined microstructure, A517 Grade B provides excellent strength-to-weight efficiency, making it suitable for critical industrial applications where safety, durability, and weight reduction are important design considerations.
Key Characteristics
The defining characteristic of Grade B is its impressive mechanical performance under extreme loads.
Yield Strength: It typically offers a minimum yield strength of 100 ksi (690MPa) for thicknesses up to 1.25 inches.
Tensile Strength: It operates in the range of 115 to 135ksi (795 to 930 MPa).
Ductility: Despite its hardness, it retains a minimum elongation of 14% to 16%, allowing for some "give" before failure.
Toughness: Grade B is specifically formulated to maintain impact resistance at low temperatures.
Grade Designation
ASTM A517 specifies quenched and tempered alloy steel
Grade B defines mechanical property limits and alloy content
Designed for demanding pressure vessel service
Comparison: ASTM A517 Grade B vs Q690
Strength: Both offer high strength, but A517 Grade B is tailored for pressure vessels
Standard: A517 Grade B follows ASTM; Q690 follows GB standards
Toughness: A517 Grade B emphasizes impact toughness for vessels
Application: Q690 is structural; A517 Grade B is pressure-vessel focused
Common Application
Pressure vessel shells
Heavy-load support structures
Industrial reactors
Energy industry equipment
Is ASTM A517 Grade B suitable for low-temperature service?
ASTM A517 Grade B offers reasonable toughness, but its low-temperature suitability depends on plate thickness and impact test requirements. It can be used in moderate low-temperature environments, provided impact testing is specified and verified according to design and code requirements.
What is the typical yield strength of ASTM A517 Grade B?
The typical yield strength of ASTM A517 Grade B is approximately 690 MPa (100 ksi). This high yield strength enables thinner plate designs and increased load capacity, making it ideal for high-stress pressure vessel and industrial applications.
Can ASTM A517 Grade B be used internationally?
Yes, ASTM A517 Grade B is widely used in international projects that follow ASTM and ASME standards. It is commonly accepted in global energy, petrochemical, and industrial sectors where high-strength pressure vessel materials are required.
Mechnical property for A517GrB steel plate:
| Thickness (mm) | Yield strength (≥Mpa) | Tensile strength (Mpa) | Elongation in ≥,% |
| 50mm | |||
| T≤65 | 690 | 795-930 | 16 |
| 65 | 620 | 725-930 | 14 |
Chemical composition for A517GrB steel plate (Heat Analysis Max%)
| Main chemical elements composition of A517GrB | |||||||||
| C | Si | Mn | P | S | B | Cr | Mo | Ti | V |
| 0.15-0.21 | 0.15-0.35 | 0.70-1.00 | 0.035 | 0.035 | 0.0005-0.005 | 0.40-0.65 | 0.15-0.25 | 0.01-0.04 | 0.03-0.08 |
1. What type of steel is ASTM A517 Grade B?
ASTM A517 Grade B is a low-alloy, high-strength steel supplied in the quenched and tempered condition. It is designed to deliver very high yield strength while maintaining adequate toughness. Unlike carbon steels, it relies on alloying elements and heat treatment to achieve superior mechanical performance, making it suitable for pressure vessels and heavy-duty industrial structures operating under high stress.
2. How does ASTM A517 Grade B differ from ASTM A516 Grade 70?
ASTM A517 Grade B has significantly higher yield and tensile strength than ASTM A516 Grade 70, allowing thinner plate designs. However, A516 Grade 70 offers better ductility and simpler welding procedures. A517 Grade B is selected for high-stress, weight-sensitive designs, while A516 Grade 70 is commonly used for moderate-pressure pressure vessels.
3. What thickness range is available for ASTM A517 Grade B?
ASTM A517 Grade B is typically supplied in medium to heavy plate thicknesses, often ranging from 20 mm to over 100 mm, depending on manufacturer capability. Thicker plates are commonly used in high-pressure vessels and heavy industrial equipment. Plate thickness selection depends on design pressure, load requirements, and applicable pressure vessel codes.
4. What precautions are needed when welding ASTM A517 Grade B?
Welding ASTM A517 Grade B requires strict control, including preheating, low-hydrogen consumables, and controlled heat input. Due to its high strength, improper welding can lead to hydrogen cracking or loss of toughness. Qualified welding procedures and, in many cases, post-weld heat treatment are essential to ensure safe and reliable joints.
5. How does ASTM A517 Grade B resist deformation?
ASTM A517 Grade B resists deformation through its high yield strength and quenched-and-tempered microstructure. These properties prevent permanent shape change under heavy load or pressure. This resistance is especially important in pressure vessels and industrial structures where dimensional stability and long-term structural integrity are critical.
6. What standards govern ASTM A517 Grade B?
ASTM A517 Grade B is governed by ASTM A517/A517M, which defines chemical composition, mechanical properties, and heat treatment requirements. When used in pressure vessels, it may also comply with ASME Boiler and Pressure Vessel Code provisions, ensuring safety and international acceptance.
7. What are the common applications of ASTM A517 Grade B?
Common applications include high-pressure vessels, industrial reactors, heavy machinery, power plant equipment, and energy-sector components. The material is chosen where high strength and load resistance are required, allowing reduced plate thickness without compromising safety.
If you want to learn more about ASTM A517 Grade B GNEE's products, you can send an email toinfo@gneesteels.com . We are more than happy to assist you.
